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* 1. Have you upgraded your battery bank to lithium ion batteries?

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* 2. If yes, did you install them yourself?

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* 3. If yes, how difficult was the upgrade? Please rate with 5 stars being most difficult.

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* 4. If you had professionals install the batteries, how did the project go? Please comment.

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* 5. If you haven't made the upgrade, are you planning to do so in the future?

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